Add basic 2 dimensional point classes

Makefile.am

@@ -18,6 +18,7 @@ UTIL_INCLUDE =  \
     maths.hpp	\
     matrix.hpp	\
     nocopy.hpp	\
+    point.hpp	\
     range.hpp	\
     region.hpp	\
     stream.hpp	\
@@ -35,6 +36,7 @@ UTIL_FILES   =	\
     json.cpp	\
     maths.cpp	\
     matrix.cpp	\
+    point.cpp	\
     range.cpp	\
     region.cpp	\
     stream.cpp	\

point.cpp

@@ -0,0 +1,44 @@
+/*
+ * This file is part of libgim.
+ *
+ * libgim is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ * 
+ * libgim is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with libgim.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Copyright 2011 Danny Robson <danny@nerdcruft.net>
+ */
+
+#include "point.hpp"
+
+#include <cmath>
+
+using namespace std;
+
+
+point::point (double _x, double _y):
+    x (_x),
+    y (_y)
+{ ; }
+
+
+double
+point::distance (const point &other) const {
+    return sqrt ((x - other.x) * (x - other.x) +
+                 (y - other.y) * (y - other.y));
+}
+
+
+double
+point::manhattan (const point &other) const {
+    return fabs (x - other.x) + 
+           fabs (y - other.y);
+}

point.hpp

@@ -0,0 +1,34 @@
+/*
+ * This file is part of libgim.
+ *
+ * libgim is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ * 
+ * libgim is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with libgim.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Copyright 2011 Danny Robson <danny@nerdcruft.net>
+ */
+
+#ifndef __UTIL_POINT_HPP
+#define __UTIL_POINT_HPP
+
+/// A two dimensional position in space
+struct point {
+    double x, y;
+
+    point (double x, double y);
+
+    double distance  (const point &) const;
+    double manhattan (const point &) const;
+};
+
+
+#endif // __UTIL_POINT_HPP